DOC: Correcting spelling of Harmonia Sacra in NR 1.1.4 Shape note heads

[Karlin High]

This is a nitpick. The places in the documentation that reference the
"Harmonia Sacra" songbook by Joseph Funk have the spelling Harmonica
Sacra. Harmonia does not have a "c" here. A few references are below.
There are enough of them that a Google search for "Joseph Funk
Harmonica Sacra" gets auto-corrected.

http://harmoniasacra.org/index.html
http://gameo.org/index.php?title=Harmonia_Sacra
https://www.amazon.com/Harmonia-Sacra-Joseph-Funk/dp/1932676155

The attached patch has proposed corrections. Translated docs would be
affected; I do not know the process for that. Possible actions:

* Forget it. Anyone who would be bothered by this is probably beyond help.
* Fix directly in git like other typos
* Go through review and tracker like other patches
-- 
Karlin High
Missouri, USA

0001-DOC-Corrects-spelling-of-Harmonia-Sacra.patch
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